Shy and Confident

Does anyone else ever have moments where you feel super confident during sex? Then other times you feel more bashful? I am totally comfortable with my fiancé. We are naked around each other a lot and are very good with communication, even during intercourse. But, I notice that some times I feel like porn star status confident, then other times I get so bashful feeling! Like, I blush and giggle like a school girl that has a crush on someone. Then, I get really shy feeling. I am still enjoying the sex fully, but intend to get a little self conscious from feeling bashful. I worry I look dumb or goofy to him during the magic. I am always wondering why I go through moments like that? I sometimes feel like it’s due to being so attracted to my fiancé that it makes me feel like that. Idk, anyone else know what I am talking about?